Indicator.



M. ARNDT.

INDICATOR.

APPLICATION FILED JUNE 11. 1903.

Patented July 6, 1909.

2 SHEETS-SHEET 1.

M. ARNDT.

INDICATOR.

APPLICATION FILED JUNE 11, 1903. l 927,207. Patented July 6, 1909. 2BIHBETESHEET 2.

l Il

MAX ARNDT, OF AIXi-LA-CHAPELLE, GERMANY.

INDICATOR.

Specification of Letters Patent.

Patented July 6, 1909.

Appueation med June 11, 1903. seria No. 161,115.

To all 'whom it may concern:

Be it known that I, MAX ARNDT, a subject of the King of Prussia, GermanEmperor, residing at the city of Aix-la-Chapelle, in the Kingdom ofPrussia, German Empire, have invented certain new and usefulImprovements in Indicators; and I do hereby declare the following to befull, clear, and exact description of the invention, such as will enahleothers skilled in the art to which it appertains to make andv use thesame, reference being had to the accompanying drawings, and to lettersor figures of reference marked thereon, which form a part of thisspecihcation.

My invention relates to indicators to determine average pressure. Forthis purpose I combine with an indicator or measure of well knownconstruction, a pressure-controlled member, directly operated by thefluid whose pressure is to be measured, that permits a quantity ofliquid, steam, air or other gas to pass to or through the measure, saidquantity depending upon the average f indicator pressure for the timebeing.

Referring to the drawings in which like parts are similarlydesignated-Figure 1 is a section through the indicator. Fig. `2 is asection through a modified form thereof. Fig. 3 is a section of a secondmodification. Fig. 4 is a section of a third modification. Fig.. 5 is asection of a fourth modification. Fig. 6 shows the indicator, Fig. 1,connected to the cylinder of an engine and a tank (shown in section)from which the passage of water to the meter M is controlled by theindicator.

Referring to Fig. 1, a and a are flanged. pipes by means of which thepressure controlled member is connected to the engine cylinder on eachside of the piston therein and said member consists of a steam chamber Adivided, by a s ring controlled element, in this case, a llexib epartition or diaphragmf,

f into two compartments t and 112, each of which is supplied by steamfrom an end of the engine cylinder to be indicated by one of the pipes aand a2. Secured to the diaphragm 7" is a rod c extending through astuffing boX i, of chamber A and guided in bearings o, o, that carries apiston valve d located in casing B, which is connected to and supportedfrom the casing containing c-hamber A by a neck n. The casing B isprovided with an inlet passage s and an outlet passage s, the latterleading from an annular chamber e. The passage of liquid into chamber eand out through s2 is controlled by the piston valve d.

The apparatus operates as follows: Each of the pipes a and a2 isconnected to an end of the cylinder of the engine. The pressures infront of and behind the piston are comifnunicated to chambers t and t2and move the diaphragm f, the rod c and piston valve d. The flow offluid, in this case water, entering casing B by passage s is controlled.by the valve d in its passage through s2 to the water meter or otherdevice. vWhen the diaphragm f is stationary no water can flow fromchamber B through e and s2. The quantity of fiuid that escapes throughs2 corresponds to the average pressure in the engine cylinder, so thatit is only necessary to measure it in order to ascertain the aver agepressure.

In the modification shown in Fig. 2, instead of a diaphragm I use aspring controlled piston that moves the piston valve. A piston 1 movesin an open ended cylinder 2, each end communicating respectively withchambers t and b2 that by means of a', a2 and 4;, 3 are connected to theengine cylinder. The piston 1 is carried by a rod 5 whose upper endprojects into casing g closed by a screw cap g. 0n the rod is anabutment 9 that takes against a loose collar 6 to which one end of thespiral spring-8 is connected, the other end of said spring beingconnected to` a similar collar 7. The rod passes through both collarsfreely and has a screw m2 in its end, said screw engaging the uppercollar 7 when the rod is moved in one direction, the lower collar beingthen limited by a shoulder m from moving downward. The screw cap glimits the movement of the upper collar 7 when the rod 5 is moved in theopposite direction, the abutment 9 then taking against the lower collar6. The lower end of the rod 5 or a section thereof passes into a casingD, carries a valve d that controls chamber e and passage s2, all of aconstruction similar to that described with reference to Fig. 1.

In Fig. 3, the casing A is similar to that shown in Fig. 1 the diaphragmf in this case carries sleeve d that controls the opening of slots c ina pipe s closed at one end, that projects into chamber A.

In the modification, Fig. a, a and a2 are nipples or short pipes toconnect the device to each end of the cylinder as before. A is acylindrical casing closed at its ends by screw-plugs g2 and having twolateral passages LL and an outlet pipe s. A piston d, the same length asthe passage u, controls them and is located between two spiral springs yand ff. lll'vhen the piston is moved by differential pressure, that is,thc resultant ol the two opposing pressures on opposite sides ol thepiston d, the passages Lt are uncovered for the passage of lluid throughs.

In the two forms shown in Figs. 3 and 4 the steam or water is permittedto escape through the nipples or pipes S, and the amount of fluid soescaping is proportional to the differences of the pressures.

In the form shown in Fig. 5, the casing A is similar to that shown inFig. l, the rod c being connected to the diaphragm f that divides thecasing A in chambers and b2, The rod c passes through the stuiiiing box0 ol casing D and operates the slide valve d2 to control the passage ofl'luid through the casing.

In F ig. 6, I have shown the manner of connecting the device to a steamengine cylinder C. Pipes r and r2 connect the short pipes c/ and c2 tothe cocks w, w, as shown and the casing D is connected by pipe s to atank o led by a pipe 't and provided with an overllow pipe n. A cut-olivalve n is located in pipe s. Pipe S2 is connected to a suitable watermetcr indicated at M. When the cock n is opened water in chamber D isunder a constant head I-I and the quantity of water allowed to passthrough D by the controlling member therein is measured by the meter.

Having thus described my invention, what 2. In an indicator, a casinghaving a water o inlet, an annular casing therein open at both ends andhaving a water outlet, a valve normally closing the ends of the annularcasing, a steam chamber, a movable element dividing the chamber into twoparts, means to admit steam from opposite ends of a steam cylinder toopposite sides of the movable element and a rod connecting the movableelement and valve, substantially as described.

In an indicator, a casing having a water inlet, a valve casing thereinhaving a water outlet, a valve controlling the passage of water from theouter to the inner casing, a steam chamber, a spring controlled memberdividing the steam chamber into two parts, means to admit steam to eachpart of the steam chamber and a rod connecting said member and valve,substantially as described.

In testimony that I claim the 'foregoing as my invention, I have signedmy name in presence of two subscribing witnesses.

MAX ARNDT. l/Vitnesses HENRY QUOIDFLIEG, E. M. BRUNDAGE.

